#include"mystdio.h"
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<string.h>
#include<stdlib.h>
#include<unistd.h>

MyFile* BuyFile(int fd,int flag)
{
    MyFile* f = (MyFile*)malloc(sizeof(MyFile));
    if(f == NULL)
    {
        return NULL;
    }
    f->fileno = fd;
    f->bufferlen = 0;
    f->flag = flag;
    f->flush_method = LINE_FLUSH;
    memset(f->outbuffer,0,sizeof(f->outbuffer));

    return f;
}

MyFile* MyFopen(const char* path,const char* mode)
{
    int fd = -1;
    int flag = 0;
    if(strcmp(mode,"w") == 0)
    {
        flag = O_CREAT | O_WRONLY | O_TRUNC;
        fd = open(path,flag,0666);
    }
    else if(strcmp(mode,"a") == 0)
    {
        
        flag = O_CREAT | O_WRONLY | O_APPEND;
        fd = open(path,flag,0666);
    }
    else if(strcmp(mode,"r") == 0)
    {

        flag = O_RDONLY;
        fd = open(path,flag);
    }
    else
    {    
        //
    }

    if(fd < 0)
    {
        return NULL;
    }

    return BuyFile(fd,flag);
}
void MyClose(MyFile* file )
{
    close(file->fileno);
}
int MyFwrite(MyFile* file,void* str,int len)
{
    //拷贝
    memcpy(file->outbuffer + file->bufferlen,str,len);
    file->bufferlen += len;
    //判断是否满足刷新条件
    if(file->flush_method & LINE_FLUSH && file->outbuffer[file->bufferlen - 1] == '\n')
    {
        MyFFlush(file);
    }
    return 0;
    
}
void MyFFlush(MyFile* file)
{
    int n = write(file->fileno,file->outbuffer,file->bufferlen);
    (void)n;
    file->bufferlen = 0;
}
